Pressure Drop in Hydraulic Valve

UdoUebel · January 18, 2016, 06:14

Hi together,

first of all Hello to all of you! Iam quite new to CFD, Star-CCM+ and this forum and I would be grateful if you could help me concerning the following fluid problem.

I have to check the pressure drop from inlet to outlet of a new hydraulic valve and got the inlet pressure and velocity. After some tests with Star-CCM and working with the Guide, I set up the following conditions:

Physic Models:
Constant Density
Liquid (Hydraulic Oil)
Segregated Flow
Turbulent
3D
Steady

Mesh:
Surface Remesher
Polyhedral Mesher
Automatic Surface Repair
Prism Layer Mesher

After running the simulation Iam now having some problems with the Post-Processing. What is the best fitting way to check the outlet pressure in this simulation? I tested some scenes, but there are so many options, what is quite confusing.

If you could give me some advices, I would be very thankful! If there are some missing informations, just ask!

Greets!

fluid23 · January 18, 2016, 11:58

Reports are what you want, not scenes. You can setup a mass flow averaged pressure at the inlet or at a derived part > section somewhere in the model. There is also a pressure drop report you can use, but it requires some considerations that you may have not included in your model.

UdoUebel · January 28, 2016, 05:28

Quote:

Originally Posted by MBdonCFD

Reports are what you want, not scenes. You can setup a mass flow averaged pressure at the inlet or at a derived part > section somewhere in the model. There is also a pressure drop report you can use, but it requires some considerations that you may have not included in your model.

Thank you! Whats the Problem with the Pressure Drop Report or what are those considerations I have to include in my model?

fluid23 · January 28, 2016, 08:55

If I recall, the pressure drop reports can only be defined at interfaces and they always report total pressure drop. If your geometry doesn't allow for interfaces where you need them or you need to look at static pressure for some reason then you will need to use pressure drop reports and then an expression report to get the delta between them.

January 18, 2016, 06:14	Pressure Drop in Hydraulic Valve	#1
UdoUebel New Member Join Date: Dec 2015 Posts: 11 Rep Power: 10	Hi together, first of all Hello to all of you! Iam quite new to CFD, Star-CCM+ and this forum and I would be grateful if you could help me concerning the following fluid problem. I have to check the pressure drop from inlet to outlet of a new hydraulic valve and got the inlet pressure and velocity. After some tests with Star-CCM and working with the Guide, I set up the following conditions: Physic Models: Constant Density Liquid (Hydraulic Oil) Segregated Flow Turbulent 3D Steady Mesh: Surface Remesher Polyhedral Mesher Automatic Surface Repair Prism Layer Mesher After running the simulation Iam now having some problems with the Post-Processing. What is the best fitting way to check the outlet pressure in this simulation? I tested some scenes, but there are so many options, what is quite confusing. If you could give me some advices, I would be very thankful! If there are some missing informations, just ask! Greets!

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January 18, 2016, 11:58		#2
fluid23 Senior Member Matt Join Date: Aug 2014 Posts: 947 Rep Power: 17	Reports are what you want, not scenes. You can setup a mass flow averaged pressure at the inlet or at a derived part > section somewhere in the model. There is also a pressure drop report you can use, but it requires some considerations that you may have not included in your model.

January 28, 2016, 08:55		#4
fluid23 Senior Member Matt Join Date: Aug 2014 Posts: 947 Rep Power: 17	If I recall, the pressure drop reports can only be defined at interfaces and they always report total pressure drop. If your geometry doesn't allow for interfaces where you need them or you need to look at static pressure for some reason then you will need to use pressure drop reports and then an expression report to get the delta between them.